Centering mechanism.



D! C. MULVIHILL. GENTEBING MECHANISM.

APPLICATION FILED JUN 14, 1910.

Patented Nov. 12,1912.

7 To all whomtt may concern:

DANIEL c; 'MULVIHILL, or cmcaoo, ILLINOIS, ASSIGNOR To ERIGAN car. aFOUNDRY COMPANY, or CHICAGO, ILLINOIS, A conromrr'ou orunw JERSEY.

csurnnme mnonemsmf Be it known that I, DANIEL O. MULVI- HILL, a citizenof the United States, residing at Chicago, in the county of Cook andState of Illinois, haveinvented certain new and "useful Improvements inCentering Mechanisms, of which the following is a specification.- v a iThis mechanism relates to a device for centering andpositioning work, sothat a tool operating thereon will operate at the same point each timejand the objects of the present invention are to provide a base memberwhich will serve, to receive work and a guide member for the tool whichwill be positioned in desired correlation to a recess in the base memberwhich receives I the work, so that the tool entering through the guidemember will be brought into desired operative relation with the work;and

the invention furtherrelates to means for centering the work withrespect to the guide member, and to means for impingin and holding thework against movement .uring the operation of the tool thereon.

The invention further consists in the features of construction andcombination ofparts 1 hereinafter described and claimed.

in the drawings -Figure l is a side elevation showing the arm forholding the work in position within the groove in the base member inraised or non-operative position; Fig. 2, a longitudinal sectional oleThe recess 6 terminates in a transversely extending groove 8, whichprovides a space below the work into which the end of the tool entersafter passing through the work. As shown more clearly in Fig. 3, therecess 6 is adapted to receive the body of the work 7, which liestransversely across the ortion 5 of the base nlember, and the leaded endof the work 9 will rest against the side of the. portion 5 of the basemem': ber, thus centering the work and insuring the correct registrationof the work with the tool. i

Secured to one end of the portion 5 of the base member is a finger 10,which is Patented Nov. 1%, w th.

offset to produce an'overhanging portion work is centered with respectto said recess, it is obvious that when the work is inserted into thebase member, and the tool inserted through the opening 12, the holeformed in the work by the passing of the tool therethrough will alwaysbe along a diameter of the work. v

In order to prevent movement of the work during the passing of the tooltherethrough, a horizontally extending swinging arm 13 is provided,which is pivoted between ears 14 formed with the base member, and isheld normally upward by means of a spring 15 interposed between the topof the base member and the lower face of the arm.

Attached to the base member, at the opposite end to that to which thearm 13 is pivoted, are companion links 1 6,'and between the upper endsof the link is secured a head 17 formed with a handle 1%. As

.shown more clearly in Figs. 1 and 2, the head 17 is pivoted 0d center,so that when This funnelthe periphery of the head will be in engagementwith the upper surface of the arm 13;

hence whenthe head is rotated the periphery thereof will act upon theupper surface of the arm 13 and force the arm downward,

as shown in Fig. 2.

Screw-threaded into thearm 13, and positioned in substantial alinementwith the groove 8, is a stem 19, having a tapered end 20. This stemserves to impinge against the work when the arm is lowered into theposition shown in Fig. 2 and prevent a movement of the work while thetool is passing therethrough. The stem is made adjustable sothat it canaccommodate itself to work of various thicknesses.

The tool usually used in. connection with this device is the ordinarydrilling tool used witha drill press, butsince the press and tool formno 'part. of the (present invention,

and since the device is .a apted to be used equally as well'with otherforms of tools,

In centermg the work, the operation is as follows: The work is insertedinto the recess 6 until the headed'end 9 is brought into engagement withthe wall of the portion 5 of the base member 4, The handle 18 is thenswung into the position shown in Fig. 2 and the head 17 will act toforce the arm 13 downward, bringing the stem 19 into engagement with thework. The tool is then advanced to enter the funnel-shaped opening 12and brought into engagement with the work; and after the completion ofthe operation of the tool upon the. workth'e handle is thrown into theposition shown in Fig. 1 and the stem 19 moved out of engagement withthe work and the work withdrawn from the recess 6. In this manner aholeor other indentation or configuration adapted to be made upon the workcan be accurately placed upon the work at the same point-at eachoperation of the tool.

0 The movements necessary by the operator In order to properlycenter-the work are,extremely simple, the work being placed intothe'recess 6 with one hand and the handle 18 actuated with the other.Thus a contmuous and quick feeding of the work into position to beoperated upon by the tool is possible and the skill of theoperator neednot be dependedupon to accurately osition the work with respect to thetoo, all

of this being performed automatically by the centering device. Thefunnel-shaped openm 12 is provided so that the tool may be' gui ed intothe center of said opening would occur if it were to contact an abruptwithout any undue strain thereon, such as shoulder and be forcedviolently into its proper position. I

Asshown' in Fig. 2, when the handle is swung to bring the. head intoosition to I force the arm 13 downward an bring; the.

stem 19 into engagement with the work, the handle will be lying at aplane to the rear 50,

of the. pivotal centerof the head, so that downward movement of the-armwill tend to force the lever 18 downwardly and thus bring the actin edgeof the head'into firmer,

contact with. t e arm 13. Thus, when the arm 13 and head are in theosition shown in Fig.1 2, the arm 13 is firm y locked in its loweredposition and movement out of such position can only be obtained by aswinging oft-he handle back into the position shown 69 in Fig. 1, sothat the peripher of the head will be drawn away from-the ase member,thus permitting the handle to rise by the action of the spring 15-."

I claim:-' w Y 1. In a "centering device, the combination of a basemember, adapted to receive the work, a clamping bar pivoted to thebas'e:

member, a lever provided with a ,.head

adaptedto engage said bar, a link pivotally 70 2. In a centeringdevice,thl combination 80 I of a base member, a clamping bar pivoted to thebase'member, means. for-locking the bar inoperative position, and anadjustable pointed membercarried by the bar for en-' g ging the work won the bar is m d\g to operative-po ition, substantially as d scribed. i

i 'ILVIHILL;

